File: strcpy.s

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;
; Ullrich von Bassewitz, 31.05.1998
;
; char* strcpy (char* dest, const char* src);
;

        .export         _strcpy
        .import         popax
        .importzp       ptr1, ptr2

_strcpy:
        sta     ptr1            ; Save src
        stx     ptr1+1
        jsr     popax           ; Get dest
        sta     ptr2
        stx     ptr2+1
        ldy     #$00

L1:     lda     (ptr1),y
        sta     (ptr2),y
        beq     L9
        iny
        bne     L1
        inc     ptr1+1
        inc     ptr2+1
        bne     L1

L9:     lda     ptr2            ; X still contains high byte
        rts